/*
 * FreeRTOS memory safety proofs with CBMC.
 * Copyright (C) 2022 Amazon.com, Inc. or its affiliates.  All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person
 * obtaining a copy of this software and associated documentation
 * files (the "Software"), to deal in the Software without
 * restriction, including without limitation the rights to use, copy,
 * modify, merge, publish, distribute, sublicense, and/or sell copies
 * of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be
 * included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 * http://aws.amazon.com/freertos
 * http://www.FreeRTOS.org
 */

/* FreeRTOS includes. */
#include "FreeRTOS.h"
#include "queue.h"

/* FreeRTOS+TCP includes. */
#include "FreeRTOS_IP.h"
#include "FreeRTOS_IP_Private.h"
#include "FreeRTOS_TCP_IP.h"
#include "FreeRTOS_Stream_Buffer.h"

#include "../../utility/memory_assignments.c"

/* This proof assumes that pxGetNetworkBufferWithDescriptor is implemented correctly. */
int32_t publicTCPPrepareSend( FreeRTOS_Socket_t * pxSocket,
                              NetworkBufferDescriptor_t ** ppxNetworkBuffer,
                              UBaseType_t uxOptionsLength );

/* Abstraction of pxGetNetworkBufferWithDescriptor. It creates a buffer. */
NetworkBufferDescriptor_t * pxGetNetworkBufferWithDescriptor( size_t xRequestedSizeBytes,
                                                              TickType_t xBlockTimeTicks )
{
    NetworkBufferDescriptor_t * pxBuffer = ensure_FreeRTOS_NetworkBuffer_is_allocated();
    size_t bufferSize = sizeof( NetworkBufferDescriptor_t );

    if( ensure_memory_is_valid( pxBuffer, bufferSize ) )
    {
        /* The code does not expect pucEthernetBuffer to be equal to NULL if
         * pxBuffer is not NULL. */
        pxBuffer->pucEthernetBuffer = malloc( xRequestedSizeBytes );
        __CPROVER_assume( pxBuffer->pucEthernetBuffer != NULL );
        pxBuffer->xDataLength = xRequestedSizeBytes;
    }

    return pxBuffer;
}

/* Get rid of configASSERT in FreeRTOS_TCP_IP.c */
BaseType_t xIsCallingFromIPTask( void )
{
    return pdTRUE;
}

void harness()
{
    FreeRTOS_Socket_t * pxSocket = malloc( sizeof( FreeRTOS_Socket_t ) );

    __CPROVER_assume( pxSocket != NULL );
    pxSocket->u.xTCP.rxStream = malloc( sizeof( StreamBuffer_t ) );
    pxSocket->u.xTCP.txStream = malloc( sizeof( StreamBuffer_t ) );
    pxSocket->u.xTCP.pxPeerSocket = malloc( sizeof( FreeRTOS_Socket_t ) );

    NetworkBufferDescriptor_t * pxNetworkBuffer = ensure_FreeRTOS_NetworkBuffer_is_allocated();
    size_t socketSize = sizeof( FreeRTOS_Socket_t );
    /* Allocates min. buffer size required for the proof */
    size_t bufferSize = sizeof( TCPPacket_t ) + uxIPHeaderSizeSocket( pxSocket );

    if( ensure_memory_is_valid( pxNetworkBuffer, sizeof( *pxNetworkBuffer ) ) )
    {
        pxNetworkBuffer->xDataLength = bufferSize;

        /* The code does not expect pucEthernetBuffer to be equal to NULL if
         * pxNetworkBuffer is not NULL. */
        pxNetworkBuffer->pucEthernetBuffer = malloc( bufferSize );
        __CPROVER_assume( pxNetworkBuffer->pucEthernetBuffer != NULL );
    }

    UBaseType_t uxOptionsLength;

    if( pxSocket )
    {
        publicTCPPrepareSend( pxSocket, &pxNetworkBuffer, uxOptionsLength );
    }
}
